Method for inductive current transmission

• US 10,516,298 B2
• Filed: 03/02/2016
• Issued: 12/24/2019
• Est. Priority Date: 03/04/2015
• Status: Active Grant

• Current Assignee: WiTech GmbH
• Original Assignee: WiTech GmbH
• Inventors: Buker, Maik-Julian, Euskirchen, Jorg Rainer, Schmidt, Marco
• Primary Examiner(s): Perez Borroto, Alfonso
• Assistant Examiner(s): Yeshaw, Esayas G
• Application Number:
  US15/555,691
• Publication Number:
  US 20180048186A1
• Time in Patent Office: 1,392 Days
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H03F 3/2173 of the bridge type
• CPC Class Codes: H03F 3/2176 Class E amplifiers
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

The invention relates to a method of inductive current transmission via at least one transmission coil subjected with electrical power by an amplifier, wherein the amplifier is operated in a zero voltage switching (ZVC) and zero current switching (ZCV) mode.

Claims

1. A method of inductive current transmission via at least one transmission coil subjected with electrical power by an amplifier, wherein the amplifier is operated in a zero voltage switching (ZVC) and zero current switching (ZCV) mode, wherein the amplifier is a class D amplifier, being readjusted by a sequence control, wherein the amplifier comprises a half bridge having two electronic switches, a series resonant circuit and two capacities allocated to the electronic switches, and further wherein the sequence control generates two square-wave signals that are phase-shifted by a half period for controlling the electronic switches and the pulse width is dimensioned such that a discharging capacity is discharged exactly when the following square-wave signal is present, and wherein, for a swing-out of the half bridge, the half bridge is short-circuited one-sidedly.

2. The method according to claim 1, wherein the sequence control generates pulses of fixed frequency as square-wave signals.

3. The method according to claim 2, wherein a presetable number of pulses is divided into equally spaced intervals and that, for power control of the amplifier, the sequence control generates a lower number of pulses than the preset number of pulses in the interval.

4. The method according to claim 2, wherein the sequence control generates pulses of presetable pulse widths as square-wave signals.

5. The method according to claim 1, wherein the sequence control generates pulses of presetable pulse widths as square-wave signals.

6. The method according to claim 5, wherein a presetable number of pulses is divided into equally spaced intervals and that, for power control of the amplifier, the sequence control generates a lower number of pulses than the preset number of pulses in the interval.

7. The method according to claim 1, further comprising a control loop between the pulse-generating sequence control and the half bridge.

8. The method according to claim 7, wherein the sequence control receives, via a data bus, information for an adjustment of power from a microcontroller.

9. The method according to claim 1, wherein the sequence control is a complex programmable logic device (CPLD) or an ASIC.